Cleusonite is partly metamict. The radiation damage results in macroscopic swelling (i. e. variable density and unit cell dimensions) and also makes the mineral appear optically isotropic. The calculated density and the crystallographical data given here are those of a crystal treated at 1000 °C (Wülser et al., 2005).

A large number of U-bearing "senaites" from Alpine localities later turned out to be cleusonite instead.

Localities for Cleusonite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality.
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(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.